What Does Carbon Dioxide (CO2) Mean?
Carbon dioxide (CO2) is a colorless, odorless, incombustible gas. It is heavier than the air and soluble in water. It is normally found in the form of gas and found in the atmosphere (about 0.04%), but can also be found in liquid or solid state when suitably pressurized.
Excessive carbon dioxide is injurious to human and animal health. Humans breathing air with more than a 5 percent concentration of carbon dioxide will lose consciousness in minutes and eventually die.